Is there a way to make baking sound to F-curves more accurate?
It's not an answer, but I've worked around it by processing the audio data in Sonic Visualizer, saving the spectrogram as a PNG, then importing the data into blender through a script I wrote. It basically splits the image into several long strips, each representing a bar, and treats each pixel in the X direction as a new frame. It sets the height of the bar based on the brightness of the brightest pixel in the current chunk, with some stuff to smooth out the motion, and then keyframes it. After I've cleaned it up a bit, I'll edit this to include it.